Portal:Telecommunication
The Telecommunication Portal
Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electrical or electronic means, typically through cables, radio waves, or other communication technologies. These means of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. Long-distance technologies invented during the 19th, 20th and 21st centuries generally use electric power, and include the electrical telegraph, telephone, television, and radio.
Early telecommunication networks used metal wires as the medium for transmitting signals. These networks were used for telegraphy and telephony for many decades. In the first decade of the 20th century, a revolution in wireless communication began with breakthroughs including those made in radio communications by Guglielmo Marconi, who won the 1909 Nobel Prize in Physics. Other early pioneers in electrical and electronic telecommunications include co-inventors of the telegraph Charles Wheatstone and Samuel Morse, numerous inventors and developers of the telephone including Antonio Meucci, Philipp Reis, Elisha Gray and Alexander Graham Bell, inventors of radio Edwin Armstrong and Lee de Forest, as well as inventors of television like Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth.
Since the 1960s, the proliferation of digital technologies has meant that voice communications have gradually been supplemented by data. The physical limitations of metallic media prompted the development of optical fibre. The Internet, a technology independent of any given medium, has provided global access to services for individual users and further reduced location and time limitations on communications. (Full article...)
Selected article -
Cox Communications, Inc. (also known as Cox Cable and formerly Cox Broadcasting Corporation, Dimension Cable Services and Times-Mirror Cable), is an American digital cable television provider, telecommunications and home automation services company. It is the third-largest cable television provider in the United States, serving approximately 6.5 million customers. It is also the seventh-largest telephone carrier in the country, serving 3.5 million Internet subscribers and almost 3.2 million digital telephone subscribers. Cox is headquartered at 6205 Peachtree Dunwoody Rd in Sandy Springs, Georgia, U.S., in the Atlanta metropolitan area. It is a subsidiary of Charter Communications. (Full article...)
General images
Color bars used in a test pattern, sometimes used when no program material is available (from History of television)
The Philco Predicta, 1958. In the collection of The Children's Museum of Indianapolis (from History of television)
1917 wall telephone, open to show magneto and local battery (from History of the telephone)
Apple iPhone smartphone (from History of the telephone)
Around 1920, radio broadcasting started to get popular. The Brox Sisters, a popular singing group, gathered around the radio at the time. (from History of radio)
Replica of the telettrofono at Museo Nazionale Scienza e Tecnologia Leonardo da Vinci of Milan, Italy, invented by Antonio Meucci and credited by several sources as the first telephone. (from History of the telephone)
Family watching TV, 1958 (from History of television)
Reginald Fessenden, the "father" of radio broadcasting in the U.S. (from History of broadcasting)
DBS satellite dishes (from History of television)
1896 telephone (Sweden) (from History of the telephone)
John Logie Baird in 1925 with his televisor equipment and dummies "James" and "Stooky Bill" (right) (from History of television)
An early experiment demonstrating the refraction of microwaves by a paraffin lens by John Ambrose Fleming in 1897 (from History of radio)
Top of cellular telephone tower (from History of the telephone)
Receiver schematic, c.1906 (from History of the telephone)
The first commercial AM Audion vacuum tube radio transmitter, built in 1914 by Lee De Forest who invented the Audion (triode) in 1906 (from History of radio)
Early pioneers of radio science and technology in the United States, including Charles Steinmetz, David Sarnoff, Irving Langmuir, and Alfred Goldsmith in 1921, photographed next to the antenna feed wires of the New Brunswick Marconi Station, one of the first transatlantic radio links. The photo includes Albert Einstein as a visiting guest. (from History of radio)
AT&T Picturephone (Mod II) fully enclosed in its housing, control pad at bottom (from History of videotelephony)
Reis's telephone around 1861, first device called telephone (from History of the telephone)
First television test broadcast transmitted by the NHK Broadcasting Technology Research Institute in May 1939 (from History of television)
A 19th century acoustic tin can or "lovers' telephone" (from History of the telephone)
Fessenden operating an underwater oscillator in 1915. (from History of radio)
Portrait of John Reith, 1st Baron Reith, in 1925, founding director general of the BBC from 1922 to 1938 (from History of broadcasting)
Private conversation, 1910 (from History of the telephone)
Lee DeForest broadcasting Columbia phonograph records on New York station 2XG, 1916 (from History of broadcasting)
Historical marker commemorating the first telephone central office in New York State (1878) (from History of the telephone)
The Regency TR-1, which used Texas Instruments' NPN transistors, was the world's first commercially produced transistor radio in 1954. Size: 3×5×1.25 inch (7.6×12.7×3.2 cm) (from History of radio)
Tihanyi' Radioskop patent (1926) was recognized as Document of Universal Significance by the UNESCO (from History of television)
The earliest photograph of a television picture, showing the face of Oliver Hutchinson in June 1926. The television picture was projected using Baird's television camera. (from History of television)
Broadcasting pioneer Frank Conrad in a 1921 portrait (from History of broadcasting)
"Doc" Herrold is shown at the microphone of KQW, c. 1925 (from History of broadcasting)
Naomi ("Joan") Melwit and Norman Banks at the 3KZ microphone, in the late 1930s (from History of broadcasting)
Thomas Edison invented the carbon microphone which produced a strong telephone signal. (from History of the telephone)
Screen idol Rudolph Valentino at the microphone of WSB in Atlanta, 1923 (from History of broadcasting)
Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation. (from History of radio)
Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. (from History of the telephone)
An early Smart TV from 2012 running the discontinued Orsay platform (from History of television)
The first mass-produced Czechoslovak TV-set Tesla 4001A (1953–57) (from History of television)
Philipp Reis, 1861, constructed the first telephone, today called the Reis telephone. (from History of the telephone)
Bell prototype telephone stamp(from History of the telephone)
Centennial Issue of 1976
AT&T magazine advertisement announcing commercial launch of Picturephone service. (from History of videotelephony)
Manfred von Ardenne in 1933 (from History of television)
Actor portraying Alexander Graham Bell in a 1932 silent film. Shows Bell's second telephone transmitter (microphone), invented 1876 and first displayed at the Centennial Exposition, Philadelphia. (from History of the telephone)
Philo Farnsworth in 1924 (from History of television)
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. (from History of the telephone)
Donald Manson working as an employee of the Marconi Company (England, 1906) (from History of radio)
Swedish Prime Minister Tage Erlander using an Ericsson videophone to speak with Lennart Hyland, a popular TV show host (1969) (from History of videotelephony)
The master telephone patent granted to Bell, 174465, March 7, 1876 (from History of the telephone)
Code of letters and symbols for Chappe telegraph (Rees's Cyclopaedia) (from History of telecommunication)
Reconstruction of Aeneas Tacticus' hydraulic telegraph (4th c. B.C.) in Kotsanas Museum of Ancient Greek Technology, Athens, Greece. (from History of telecommunication)
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Selected biography -
John Logie Baird (/ˈloʊɡi bɛərd/; 13 August 1888 – 14 June 1946) was a Scottish inventor, electrical engineer and innovator who demonstrated the world's first mechanical television system on 26 January 1926. He went on to invent the first publicly demonstrated colour television system and the first viable purely electronic colour television picture tube.
In 1928, the Baird Television Development Company achieved the first transatlantic television transmission. Baird's early technological successes and his role in the practical introduction of broadcast television for home entertainment have earned him a prominent place in television's history. (Full article...)
Did you know (auto-generated) -
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